Turning it inside out

By noting that init and job are separate, we can do:

    struct task {
        char *name; void *arg;
        int (*init)(void *arg, struct task *t);
        int (*job)(void *arg, struct task *t);
        unsigned long nextrun, period;
    };

    struct task task_temperature = { ... };

    DECLARE_TASK(task_temperature); /* creates entry in ELF section */

The code above can be made better (please suggest), but:
It uses a single stack
You can look at (or change) task status
You can add extra info in the same structure.

Even if some experts dislike this, some love it like I do

And we can add preemption later (with a single stack)